Alkaline battery

Inactive Publication Date: 2006-08-03
HITACHT MAXELL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The object of the present invention is to provide an alkaline battery which comprises a negative elec

Problems solved by technology

In the case of an alkaline battery having a negative electrode comprising zinc or zinc alloy particles as an active material, if short-circuit is formed, zinc oxide, which is formed by discharging, is reduced and forms zinc, and zinc formed is corroded to rapidly generate ga

Method used

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Examples

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example 1

[0054] Manganese dioxide containing 1.6% by weight of water, graphite, polytetrafluoroethylene powder and an alkaline electrolytic solution for positive electrode mixture preparation (an aqueous solution comprising 56% by weight of potassium hydroxide with 2.9% by weight of zinc oxide) were mixed in a weight ratio of 87.6:6.7:0.2:5.5 at 50° C. to prepare a positive electrode mixture. In this mixture, 7.6 parts by weight of graphite was used based on 100 parts by weight of manganese dioxide. The concentration of potassium hydroxide in the electrolytic solution contained in the positive electrode mixture was 44.6% by weight with taking the water content of manganese dioxide into account.

[0055] Next, a zinc alloy particles containing indium, bismuth and aluminum in amounts of 0.05% by weight, 0.05% by weight and 0.005% by weight respectively, polysodium acrylate, polyacrylic acid and an alkaline electrolytic solution for negative electrode mixture (an aqueous solution comprising 33.5%...

example 2

[0060] An alkaline battery of this Example was produced in the same manner as in Example 1 except that zinc alloy particles having an average particle size of 102 μm, all the particles of which passes through sieve openings of 80 mesh and 30% by weight of which passes through sieve openings of 200 mesh, were used in the negative electrode.

example 3

[0061] An alkaline battery of this Example was produced in the same manner as in Example 1 except that zinc alloy particles having an average particle size of 95 μm, all the particles of which passes through sieve openings of 80 mesh and 40% by weight of which passes through sieve openings of 200 mesh, were used in the negative electrode.

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PUM

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Abstract

An alkaline battery comprising a positive electrode, a negative electrode containing zinc or zinc alloy particles, an outer body, and a resin sealing member having a thin-walled part for preventing explosion, wherein all zinc or zinc alloy particles in the negative electrode pass through sieve openings of 80 mesh and 20 to 80% by weight of the zinc or zinc alloy particles pass through sieve openings of 200 mesh sieve, which has excellent load characteristics and high safety achieved by the prevention of heat-generation at the time of short-circuiting.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an alkaline battery, in particular, an alkaline battery having excellent load characteristics and high safety achieved by the prevention of heat-generation at the time of short-circuiting. [0003] 2. Description of the Related Art [0004] Alkaline batteries which utilize zinc as a negative electrode active material are used as power sources for various electronic equipments, and have required characteristics which vary depending on their usage. Particularly, in the case of digital cameras the use of which has spread rapidly in recent years, in order to increase the capacity to shoot as many pictures as possible, the batteries are required to provide a higher capacity and further improved load characteristics such as a large current discharge characteristic. Therefore, battery designs fulfilling these demands are sought. [0005] To improve the load characteristics, various attempts have ...

Claims

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Application Information

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IPC IPC(8): H01M2/08H01M4/42H01M4/06H01M6/08H01M50/184H01M50/193
CPCH01M2/08H01M2/1241H01M4/244H01M4/42H01M2004/021Y02E60/124Y02E60/10H01M50/3425H01M50/184H01M50/193
Inventor IWAMOTO, SHINICHIHIROSE, YOSHIHISAITO, NORIYUKI
Owner HITACHT MAXELL LTD
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